<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div></div>
    <script>
        const spec = {size:'40cm*40cm', color:'黑色'}
        const div = document.querySelector('div')

        // 1.获取对象的所有属性
        const res = Object.values(spec)
        // 2.将数组以 / 分隔,转为字符串
        div.innerHTML = res.join('/')
    </script>
</body>
</html>